3com 4500 PWR 26-PORT Manual De Usuario

for the device and ports.  This command enables/disables RSTP on a device in 
system view and enables/disables RSTP on a port in Ethernet Port View. 

Related command: 

.

To enable RSTP on a Switch, enter the following:

<4500>system-view

System View: return to User View with Ctrl+Z.

[4500]stp enable

To disable RSTP on Ethernet1/0/1, enter the following:

[4500]interface Ethernet1/0/1

[4500-Ethernet1/0/1]stp disable

System view

None

Use the 

command to enable BPDU protection on a Switch. 

Use the 

 command to resume the default status of 

BPDU protection function.

By default, BPDU protection is not enabled.

For an access layer device, its ports are generally directly connected to a user 
terminal (such as a PC) or file server, and configured as an edge port to implement 
fast transition. When such a port receives BPDU packets, the system will set it to a 
non-edge port and recalculate the spanning tree, which will cause network 
topology flapping. In normal circumstances, these ports should not receive any 
BPDU packets. However, someone may forge BPDU to maliciously attack the 
Switch and cause network flapping.

RSTP provides the BPDU protection function against such an attack. After the 
BPDU protection function is enabled on a Switch, the system will disable an edge 
port that has received BPDUs and notify the network manager about it. The 
disabled port can only be re-enabled by the network manager.

To enable BPDU protection function on a Switch, enter the following:

<4500>system-view

System View: return to User View with Ctrl+Z.